i attempting load 3 images using method below. problem this, recieve no errors completion block , 3 images show after close detailedviewcontroller , reopen it.
what missing ? help, appreciated.
- (uiimage*)loadimagefav1:(nsstring *)nameemail { uiimageview *img =[[uiimageview alloc]init]; // nsstring *strback = [nsstring stringwithformat:@"%@%@%@", self.urlprefix,[self.selectedprofile objectforkey:nameemailpro],@"_b.png"]; nsstring *strprofi = [nsstring stringwithformat:@"%@%@%@", self.urlprefix,nameemail,@"_fav1.png"]; // // nsurl *bkgurl = [nsurl urlwithstring:[strback stringbyaddingpercentescapesusingencoding:nsutf8stringencoding]]; nsurl *f1url = [nsurl urlwithstring:[strprofi stringbyaddingpercentescapesusingencoding:nsutf8stringencoding]]; // // set imges below nslog(@"selected fprofile ......str data...%@",strprofi); ////////strt weakimageviewf1= self.friendimageview1; [img sd_setimagewithurl:f1url placeholderimage:[uiimage imagenamed:@"profile-1.jpg"] options:sdwebimageretryfailed completed:^(uiimage *image, nserror *error, sdimagecachetype cachetype, nsurl *imageurl) { nslog(@"error...back..log %@", error); if (image) { // update model image downloaded nslog(@"complete...background...ssssss"); weakimageviewf1.image = image; [weakimageviewf1 setneedslayout]; } }]; ////// // test simple call // [img sd_setimagewithurl:f1url placeholderimage:[uiimage imagenamed:@"profile-1.jpg"] completed:^(uiimage *image, nserror *error, sdimagecachetype cachetype, nsurl *imageurl) { // if(error){ // nslog(@"callback error:%@",error); // } // if(image){ // nslog(@"callback image:%@",image); // } // }]; return img.image; } call 3 images in viewdidappear
if ([self loadimagefav1:self.emailid] != nil) { // call same method on background thread dispatch_async(dispatch_get_global_queue(dispatch_queue_priority_default, 0), ^{ uiimage *tmpf1 = [self loadimagefav1:self.emailid]; uiimage *tmpf2 = [self loadimagefav2:self.emailid]; uiimage *tmpf3 = [self loadimagefav3:self.emailid]; // update ui on main thread dispatch_async(dispatch_get_main_queue(), ^{ self.friendimageview1.image = tmpf1; self.friendimageview2.image = tmpf2; self.friendimageview3.image = tmpf3; }); }); }
///// got working love explication - thanks
so working set sdwebimagewithurl original imageview directly , stopped using temp uiimageview *img = [[uiimagevew alloc]init];
i went from:
[img sd_setimagewithurl:f1url placeholderimage:[uiim... to:
[self.friendimageview1 sd_setimagewithurl:f1url placeholderimage:[uiim...
it concurrency problem. sdwebimage asynchronous you're screwing doing own manual asynchronous thread.
here you're saying:
- in new background thread (thread a), start downloading images.
- this new background thread (thread a) starting it's own background thread (thread b, sdwebimage doing you).
- your background thread ends.
- the code in
dispatch_get_main_queuesection runs, thread b still in process of downloading images aren't available yet.
the reason show next time because sdwebimage has cached them first attempt.
to fix problem should move code runs in dispatch_get_main_queue section completed block sdwebimage call.
edit:
the reason change fixed because sdwebimage takes care of loading uiimage uiimageview gave in first place. saying "load image uiimageview named img , assign image other uiimageview named self.friendimageview1", @ point in time current image assigned img placeholder image, since 1 internet had not yet downloaded. said, sdwebimage doing download automatically in background thread, , when download done assigning downloaded image uiimageview calling on. original code added middleman.
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